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TPA6138A2 Fiches technique(PDF) 8 Page - Texas Instruments |
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TPA6138A2 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 18 page c L O 1 f = 2 R C p O L c 1 C = 2 R f p OPAMP Co Mute Circuit Output Enable + + + – Conventional Solution Mute Circuit Output Enable 3.3 V + – TPA6138A2 Solution VDD VSS GND VDD VDD/2 GND DirectPath™ 9 V–12 V TPA6138A2 SLOS704A – JANUARY 2011 – REVISED MAY 2011 www.ti.com APPLICATION INFORMATION Single-supply line-driver amplifiers typically require dc-blocking capacitors. The top drawing in Figure 7 illustrates the conventional line-driver-amplifier connection to the load and output signal. DC blocking capacitors are often large in value. The headphone load (typical resistive values of 16 Ω to 32 Ω) combine with the dc blocking capacitors to form a high-pass filter. Equation 1 shows the relationship between the load impedance (RL), the capacitor (CO), and the cutoff frequency (fC). (1) CO can be determined using Equation 2, where the load impedance and the cutoff frequency are known. (2) If fC is low, the capacitor must then have a large value because the load resistance is small. Large capacitance values require large package sizes. Large package sizes consume PCB area, stand high above the PCB, increase cost of assembly, and can reduce the fidelity of the audio output signal. Figure 7. Conventional and DirectPath Line Driver The DirectPath amplifier architecture operates from a single supply but makes use of an internal charge pump to provide a negative voltage rail. Combining the user-provided positive rail and the negative rail generated by the IC, the device operates in what is effectively a split-supply mode. The output voltages are now centered at zero volts with the capability to swing to the positive rail or negative rail. The DirectPath amplifier requires no output dc-blocking capacitors. The bottom block diagram and waveform of Figure 7 illustrate the ground-referenced line-driver architecture. This is the architecture of the TPA6138A2. 8 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s): TPA6138A2 |
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